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The paper analyzed the characteristics of channel and overbank flood, such as the bankfull discharge, runoff and sediment and the evolution rule of Xiaobeiganliu section of the Yellow River. It built the actual relationship of storage capacity to forecast the overbank flood based on the measuring data of the stage and cross-section. When the high sediment overbank flood happened, the runoff volume decreased and stored in the bottomland and the peak hydrograph was attenuating. The paper built the runoff and sediment detention model to forecast the high sediment overbank flood. The results show that the test qualified rate of 21 forecasted overbank floods is 85.7% since 1960, the certainty coefficient is 0.87 and 0.93 and the peak discharge accuracy is 86.5% and 96.3% respectively of “August 1992” and “August 1996” flood forecasting. [ABSTRACT FROM AUTHOR]